hv1: early-exit at main (no plugin init); tokenizer: Stage-3 single-quote + full escapes (\/ \b \f \' \r fix); builder: route BinOp via SSOT emit_binop_to_dst; hv1 verify canary route (builder→Core); docs: phase-20.39 updates

src/runner/json_v0_bridge/lowering/loop_.rs

@@ -126,8 +126,11 @@ pub(super) fn lower_loop_stmt(
     // open snapshot frames for nested break/continue
     super::push_loop_snapshot_frames();
     loop_stack.push(LoopContext { cond_bb, exit_bb });
+    // Detect simple increment hint for this loop body
+    super::detect_and_push_increment_hint(body);
     let bend_res = lower_stmt_list_with_vars(ops.f, body_bb, body, &mut body_vars, loop_stack, env);
     loop_stack.pop();
+    let _ = super::pop_increment_hint();
     let bend = bend_res?;
     // collect snapshots for this loop level
     let continue_snaps = super::pop_continue_snapshots();